Instead - do what actually works: have them do the normal Toyota prescribed "Precision Balance" - which is a LUG CENTRIC balance (which works 75% of the time) rather than the CONE centric balance (which fails 99.97% of the time).
Or - find someone that knows how to use a balancer, how to set the wheel on the balancer, and will do a 1/4 ounce or better balance.
Then, once the balance is done, do not let them mount the wheels IF there are weights on the rim that are 180 degrees apart as that is 100% proof they screwed up.